barbed sea urchin cactus

Grow in a cool frost-free greenhouse (minimum temperature 2-7ºC) in very free-draining compost, such as John Innes No. 2 with at least an equal amount of grit or fine gravel, in bright, filtered light, and water moderately while growing, but keep dry from mid-autumn until early spring; for more advice, see houseplant cacti and succulent cultivation

No pruning required

Propagate by division from offsets

May be affected by mealybugs

Generally disease-free